Both great evils, but I think it would be silly to humour the possibility that the Nazi ideology was somehow more noble than Stalinism
In just a few short years, Nazism wiped out millions in a totally pointless ideological quest - it didn't even have the goals that Stalinism held (industrialisation) but was instead motivated solely on racial grounds that would actually hinder the German war effort.
It's one of the reasons why I am astonished there are people on this forum right now who unironically believe the Nazis to be saviours of Western civilisation.